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UC3843BDTR

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XBLW UC3843BDTR XBLW AC-DC Controllers and Regulators, SOP-8. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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Contents

README

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UC3843BDTR

XBLW · AC-DC Controllers and Regulators · SOP-8

UC3843BDTR from XBLW, in a SOP-8. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 COMP output Error amplifier compensation pin. Connect external compensation components between COMP and VFB to shape the error amplifier's frequency response and set loop stability.
2 VFB input Voltage Feedback input. Inverting input to the internal error amplifier; the internal reference is 2.5 V. Connect the divided output voltage here to close the converter's voltage-feedback loop.
3 ISENSE input Primary-side current sense input. Connect to the current-sensing resistor; the PWM latch terminates the OUTPUT switch conduction when this pin reaches ~1.0 V (max current-sense threshold).
4 RT/CT passive Oscillator timing pin. Connect RT to VREF (pin 8) and CT to GND from this pin to set the switching frequency and maximum duty cycle. Maximum operating frequency up to 500 kHz.
5 GND power_in Device ground reference for control logic and power stages.
6 OUTPUT output Totem-pole/push-pull gate drive output for the external power MOSFET. Sources and sinks peak currents up to 1 A; VOH typ. 13.5 V at 20 mA source, VOL typ. 0.1 V at 20 mA sink.
7 VCC power_in Positive supply input to the device. UVLO start-up threshold ~8.4 V, turn-off ~7.6 V; absolute max 30 V. Startup current <0.5 mA, operating current ~12 mA typ.
8 VREF power_out 5 V internal reference output (typ. 5.0 V, 4.9-5.1 V). Provides charging current to the oscillator timing capacitor through the timing resistor and can supply small external loads.

Key specifications

Parameter Value
Manufacturer XBLW
Package SOP-8
Category PMIC
Pins 8

Ordering variants

Same part, different packaging or reel option.

  • UC3843BDTR
  • UC3843BDTRAN

CAD (KiCad official)

  • Symbol: UC3843BDTR
  • Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
  • 3D model: SOP-8 (KiCad packages3D, STEP)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: XBLW datasheet (11 pp, sha256 a963465d88941e22, retrieved 2026-08-17, tier: lcsc)
  • Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF